Bis(dialkylaminomethyl)-phenylenedipalladium (II) compounds

ABSTRACT

Certain bis(di-lower-alkylaminomethyl)phenylenedipalladium(II) halides (I), e.g., 3,6-bis(diethylaminomethyl)-1,2phenylenedipalladium(II) dichloride and the corresponding 2,5-, 1,4- isomer, are prepared by reacting a complex inorganic palladium halide with a bis(dialkylaminio)xylene, e.g., sodium palladium chloride with Alpha , Alpha &#39;&#39;-bis(diethylamino)-pxylene. Compounds I can be converted to novel chelates (II), e.g., 2,5-bis(diethylaminomethyl)-1,4-phenylenedipalladium(II) bis(2,4-pentanedionate), or salts (III), e.g., 3,6bis(diethylaminomethyl)-1,2-phenylenebis(pyridinepalladium(II)) Mu -chloride hexafluorophosphate, by reaction with a chelating agent, e.g., 2,4-pentanedione, or a cyclic amine, e.g., pyridine. The compounds are useful as components of precious-metal decorating compositions and as catalysts for polymerizing acetylene.

United States Patent n 1 Trofimenko BIS(DIALKYLAMINOMETHYL)- PHENYLENEDIPALLADIUM (u COMPOUNDS [75] Inventor: Swiatoslaw Trofimenko,Newark,

Del.

[73] Assignee: E. I. du Pont de Nemours & Company, Wilmington, Del.

[22] Filed: Sept. 6, 1973 [21] Appl. No.: 394,824

Related US. Application Data [60] Division of Ser. No. 75233, Sept. 24, 1970, Pat. No. 3.770,?85. Continuation-impart of Ser. No. 792.841, Jan. 21 1969, abandoned.

{52} US. Cl 260/429 R; 106/1; 117/130; 117/160; 252/431 N; 260/941, 260/242; 260/270 A; 260/299; 260/307; 260/307 D;

260/309 [51] Int. Cl. C071 15/00 [58] Field of Search 260/429 R, 429 .l

[56] References Cited OTHER PUBLICATIONS Kasahara, Bull Chem. Soc. Japan 41, (1968) p. 1372. Cope et al., .1. Am. Soc., 90, (1968) p. 909-913.

[ May 13, 1975 Primary ExaminerArthur P. Demers [5 7] ABSTRACT Certain bis( di-lower-alkylaminomethyl phenylenedipalladiumfll) halides (l), e.g., 3,6- bis(diethylaminomethyl)-1,2- phenylenedipalladiumfll) dichloride and the corresponding 2.5-, l,4 isomer, are prepared by reacting a complex inorganic palladium halide with a bis(dialkylaminio)xylene, e.g., sodium palladium chloride with a,a'-bis(diethylamino)-p-xylene. Compounds 1 can be converted to novel chelates (ll), e.g., 2,5- bis(diethylaminornethyl l ,4- phenylenedipalladiu'mfll) bis(2,4-pentanedionate), or salts (lll), e.g., 3,6-bis(diethylaminomethyl)-l,2- phenylenebis(pyridinepalladium(ll)) ii-chloride hexafluorophosphate, by reaction with a chelating agent, e.g., 2,4-pentanedione, or a cyclic amine, e.g., pyridine. The compounds are useful as components of precious-metal decorating compositions and as catalysts for polymerizing acetylene.

6 Claims, No Drawings 1 BlS( DIALKYLAMINOMETHYL PHENYLENEDIPALLADIUM (Il) COMPOUNDS RELATED APPLICATION This application is a division of my copending application Ser. No. 75,233, filed Sept. 24, 1970, now US. Pat. No. 3,770,785 which is a continuationin-part of my copending application Ser. No. 792,841, filed Jan. 21, 1969, now abandoned.

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to, and has as its principal object provision of, new binuclear organo-palladium compounds. The products of the invention are bis(di-loweralkylaminomethyl)-phcny1enedipalladium (11) compounds in which each palladium atom is ortho to a dialkylaminomethyl group and the benzene ring can contain up to two inert substituents.

2. Relationship to the Art Heck, .1. Am. Chem. Soc., 90, 313 (1968) discloses reaction of 2-(phenylazo)phenylpalladium(ll) chloride with 2,4-pentanedione to give a solid product assigned the structure The azophenyl moiety that forms one ring with the palladium is disclosed as equivalent to a dimethylaminomethylphenyl moiety.

My above-mentioned application Ser. No. 792,841, of which this is a continuation-in-part, discloses aminoarylpalladium(l1) chelates such as 2- dimethylaminomethylphenylpalladium(ll) 2,4- pentanedionate. These compounds are mononuclear analogs of the products of formula II of the present invention. in addition, Ser. No. 792,841 discloses aminoarylpalladiumfll) halides as precursors of the foregoing chelates. The halides are the corresponding mononuclear analogs of products of formula 1 of the present invention.

DESCRlPTlON OF THE INVENTION The new compounds of this invention, derived from substituted xylenes, include:

2 bistdi-lower-a1kylaminomcthyl)phcnylenedipalladium(ll) dichlorides and dibromides (l), bis(di-lower-alkylaminomethyl)phenylenedipalladium(II) dichelates (I1), and bis(di-loweralkylaminomethyl)phenylenebis(diligandpalladium(II)) salts (Ill). The formulas of these compounds are:

( asa -Q PdCh Qm (R2NCH2 @4 z 2A III In the above formulas,

R is lower alkyl, i.e., an alkyl group of up to 8 carbons, further defined below;

Q is a monovalent substituent, further defined below;

the subscript m is 0, l, or 2;

X is C1 or Br;

Ch is a monovalent, bidentate chelate ligand, further defined below;

L is a cyclic tertiary amine having aromatic properties, in which amine the amino nitrogen is intracyclic, defined further below; and

A is one equivalent of an anion, also further defined below.

A compound of formula I, II or 111 can have any of five isomeric structures, depending on the relative positions of the dialkylaminomethyl groups, the palladium atoms, and the Q groups, if any, in the benzene ring. All such isomers, determined by the Xylene isomers used as precursors, are included in the products of the invention. The various products can be represented by the formulas which follow. Inspection of these formulas shows that compounds of formulas Ia and 1b are formed from bis(dialkylamino)-p-xylenes, those of formulas 1c and 1d, from bis(dialkylamino)-m-xylenes, and those of formula Ie, from bis(dialkylamino)-o-xylenes.

X /NR2 /NR2 Qm ca, Qm (Jr-r x Pd NR2 Pd ,ua Pd-X it on; Pd-X A 11,5 as R N NR2 on Qm-G cs2 1rd 2 Pd-x Pd Pd I ca mi:

| l l l x if x x x Pd rm x- Pd NR;

18 lb Ic Id Ie 3 4 Ch /NR2 NR2 Q CH2 cw CH2 ch:PdNR- I Pd cn pdfjch ,cn ca, Pd Qch ire, fit m m w d en; Pd Pd can Pd \a ca I2 (l ChCPd-L'R ChZLPd-ia'R- Ch NR Ch Ch 11a 11b IIc IId IIe NR2 I: 1:; CH2 q Pd Cl-l PdL CH CH R2" N z 2A X A \NRZ 2A- CH Pa Pd L Pd Pd L ca2 If L L L IIIa II Ib IIIc L 2 L Pd NR L 2 I m H QH til-NR L Pd NR If L IIId IIIB Because of ease of isolation, e.g., by chromatogran j phy, the preferred isomers for each type are those rep Q resented by formulas a, b, c, and e, especially a, b, and /Pd CH2 0 Iii In all the foregoing compounds each palladium atom 50 Cll Pd has a formal valence (oxidation number) of 2 and a coordination number of 4. X X

One of the two formal valences of each palladium 1 atom is satisfied by the bond to a carbon of the benzene ring, and two of the four coordination sites of each palladium atom are satisfied by (l) the same bond to a carbon of the benzene ring and (2) the bond to the nitrogen of the adjacent dialkylaminomethyl group The remaining one formal valence and two coordination sites of each palladium atom are satisfied as fol- 60 lows:

In compounds of formula I, the other formal valence is satisfied by the halogen X, and, since the compounds are polymeric in the solid state, the two other coordination sites are satisfied by halogen bridging. For example, in a compound of formula la the repeating unit in the solid state has the formula As is usual in inorganic and organo-inorganic chemistry, compounds of formula I are represented, for convenience, by their monomeric formulas.

In compounds of formula II, the second formal valence is satisfied by one of the two bonds to the chelate ligand Ch. The two other coordination sites are satisfled by this bond and by the second, coordinate bond to the same chelate ligand.

ln compounds of formula Illa, c, d, and e, the second formal valence is satisfied by one of the anions A. The

third and fourth coordination sites are satisfied by the two ligands L. In compounds of formula IIIb, the second formal valences of the two palladium atoms are satisfied by the anion A and the bridging halogen X. One coordination site of each palladium atom is satisifed by L and one by the bridging halogen X.

In accordance with modern formulation, no distinction is made between covalent and coordinate bonds; aromatic ring systems, such as the benzene ring, the PdCh chelate ring, and the aromatic rings represented by the ligand L, are depicted by delocalized formulas. For comparison, the classical formulas of the products of Examples 2 and 8 would be the following:

CH NEt Preparation of the Products Compounds of formula I are prepared by the reaction of Na PdCh or NflgPdBE; with an a,a'-bis(dialkylamino)-o-, m-, or p-xylenc in liquid phase and in the presence of a basic catalyst, e.g., a trialkylamine or an N-alkylalkylenimine. An illustrative equation for this reaction can be written as follows:

C CH2 cat H2 (H Na PdX u 9 H PCIX 2 is &

CH9NR XPd dX R N--CH Ordinary temperatures usually suffice, although higher temperatures can be used. Methyl, ethyl, and propyl alcohols are suitable solvents, preferably diluted with about 5IO percent water, Operable palladiumcontaining reactants include also other alkali-metal salts containg the PdX, anion, salts of the type M Pd X and (nitrile) PdX complexes, where X is C] or Br and M is an alkali metal.

The products of formula II are prepared from those of formula I by what are essentially well-known procedures. The preparation of metal chelates, in which one or more Ch groups as defined above are bonded to a metal, from metal halides and the parent CHH, is, in fact, widely reported. Various embodiments of the process are reviewed, for example, in Inorganic Syntheses, Vol. II, ed. Fernelius, pp. 10-20 ff. (McGraw-Hill, 1946) and Vol. XI, ed. Jolly, pp. 72-82 ff. (I968). Preparations of individual metal chelates are scattered throughout the chemical literature, and references to some of these publications are given in Inorganic Syntheses.

The palladiumfll) chelates of formula II can be prepared by reaction of a halide of formula I with (a) a compound ChH in the presence of a base or (b) a preformed metal salt of a compound ChH, in which the H is replaced by one equivalent of a metal. The base can be, for example, a hydroxide, oxide, or carbonate of an alkali metal or it can be ammonia, a primary, secondary, or tertiary alkylamine, or a quaternary ammonium hydroxide. Both these methods are mentioned in Inorganic Syntheses. If a preformed salt is used, it is usually an alkali-metal salt or a thallium salt.

In preparing the products of formula II, it is convenient to use a solvent such as dimethylformamide or a di(lower alkyl)amide of a lower alkanecarboxylic acid. The products are usually soluble in such solvents, and thus the initial reaction mixture need not be homogeneous.

Compounds of formula II] can be prepared by reacting a compound of formula I with an aromatic tertiary amine L, usually in excess. The primary product is a compound of formula III in which A is X. Other values of A can be introduced by conventional anionexchange processes, for example, precipitation with a large anion such as hexafluorophosphate, PE Anions that do not give insoluble salts can be introduced by use of anion-exchange resins.

The scope of the products of the invention can be more clearly understood from the following discussion of the various terms in formulas I, II and Ill.

The R Groups R is lower alkyl, i.e., an alkyl group of up to 8 carbons. The two R groups attached to any one nitrogen atom can be the same or different but preferably are the same, because of ease of preparation of the intermediates. At least one of the two R groups bonded to a given nitrogen is primary, i.e., it is bonded to the nitrogen through a carbon bonded to at least two hydro gens. Examples of R are methyl, ethyl, propyl, isopropyl, sec-butyl, tert-pentyl, isohexyl, Z-ethylhexyl, and octyl.

THe Q Group Q can be primary or secondary lower alkyl, lower alkoxy, halo, nitro, cyano, or lower alkoxycarbonyl. Examples are methyl, isopropyl, sec-butyl, isopentyl, heptyl, ethoxy, isobutoxy, hexyloxy, fluoro, chloro, bromo, iodo, methoxycarbonyl, propoxycarbonyl, secbutoxycarbonyl. When m is 2, the Q groups can be the same or different; preferably they are the same. Preferably, because of availability of intermediates, m is at most I, and most preferably it is 0 Q. groups are introduced into products of the invention by using as starting materials a,60'-bis(dialkylamino)xylenes bearing appropriate Q substituents.

The Chelate Ligand Ch Ch is a monovalent, bidentate chelate ligand formed by removal of an acidic hydrogen from a beta-diketone a beta-keto aldehyde.

a beta-keto ester,

a beta-hydrocarbylimino ketone,

a beta-hydrocarbylimino ester,

a bcta-bis(hydrocarbylimino)alkane, or

a tropolone.

Beta-diketones, beta-keto aldehydes, betaketo esters, beta-hydrocarbylimino ketones, betahydrocarbylimino esters. and beta-bis(hydrocarbylimino)aikanes are known compounds. The compounds ofthese structural types that can form monovalent, bidentate chelate derivatives with metal ions by removal of one hydrogen per ligand, by processes discussed earlier, are well known to those skilled in the art In general, any such compound in which the carbon between the two carbonyl carbons is bonded to at least one hydrogen and in which at most one ofthe carbonyl carbons is part of a ring will form chelaltes in this manner. The chelate portions of the molecules of the products of this invention can be derived from any such compounds. Carbonyl carbon" as herein used means either of the carbon atoms bonded to carbonyl oxygen or a hydrocarbylimino group (=Nr') (cf. Z in formula V. below) The preparation of beta-diketones and beta-ket0 aldehydes is described by Hauser et al. in Chapter 3 of "Organic Reactions," Vol. VII], edited by Adams et al. Similarly, the preparation of beta-keto esters is described by Hauser and Hudson in Chapter 9 Vol. I of Organic Reactions" (Wiley, i942). Beta-keto imines and their chelate-forming properties are discussed by Martin et al., J. Am. Chem. Soc., 83, 73 (196i and in Inorganic Syntheses, Vol. XI, ed. Jolly, pages 72 ff. (McGraw-Hill, l968). Bis-(hydrocarbylimino) derivatives of beta-diketones and their conversion to metal chelates are described by Parks and Holm, Inorg. Chem, 7, 1408 (1968).

Operable beta-dicarbonyl compounds and hydrocarbylimino derivatives thereof, Ch-H, that can be used to form the chelate portion of the molecule include those of the formula H II wherein:

Z is O or NR, R being lower alkyl. aryl, or substituted aryl; the two Z groups in a given molecule can be the same or different; and preferably at most one Z is NR; and

The Y groups in a single molecule are the same or different and are hydrogen, alkyl. cycloalkyl, lower fluoroalkyl, aryl. alkoxy, aryloxy, or aralkoxy, at most one of them being hydrogen. alkoxy, aryloxy, or aralkoxy, The aryl and heterocyclyl Y groups can contain inert substitutents such as halo, lower alkyl, and lower alkoxy.

As is well known to those skilled in the art, the strcu ture of the chelate ligand, Ch, formed by removal of a hydrogen from a chelate ligand precursor, ChH, of formula V is, by modern methods of representation,

t-buty] 3-oxobutanoate, phenyl 3-oxobutanoate, benzyl 3-0xobutanoate, ethyl 3-oxohexanoate, ethyl 3-cyclohexyl-3-oxopropanoate, methyl 3-oxo-3- phenylpropanoate, ethyl 3-oxopentanoate, ethyl 3-(p-anisyl)-3-oxopropanoate, isobutyl 3- 4r) oxobutanoate, 4-phenylimino-Z-pentanone, 4-(oanisylimino)-2-pentanone, 4-(p-tolylimino)-2-pentanone, 4-(2,6- dimethylphenylimino)-2-pentanone, 4-(pehlorophenylimino)-2-pentanone, l-phenyl3- phenylimino-l-butanone, l,3-diphenyl-3-phenylimino l-propanone, 4-phenylimino-2-butanone, 4-methylimino-2-pentanone (enol" or eneamine" form, 4-methylamino-3-penten-2-one), ethyl 3- phcnyliminobutanoate, ethyl 3-(0- tolylimino)butanoate, Z-phenylamino- 4-phenylimino-2-pentene, 2-(m-tolylamino)-4-(mtolylimino)-2-pentene, and l-phenylamino-Eiphenyliminopropene. The last three compounds are named as the enol or eneamine isomers. The corresponding keto or aneimine isomer for, e.g., the first compounds is 2,4-bis(phenylimino)pentane (cf. formula V). Regardless of which isomer predominates in this or any other type of ligand precursor ChH, the same metal chelate will be obtained.

The more readily available compounds of formula V are those in which Y is alkyl of at most [2 carbons, cyeloalkyl of 5 or 6 ring carbons, lower fluoroalkyl; aryl of at most 10 carbons and containing up to two substituents selected from halo, lower alkyl, lower alkoxy, and hydroxyl; hydrogen, lower alkoxy, aryloxy of up to [O carbons, and aralkoxy of up to 10 carbons, at most one Y being hydrogen, alkoxy, aryloxy, or aralkoxy. Products of the invention in which the chelate portion contains such Y groups are therefore preferred. More preferably, Y is hydrogen, lower alkyl, cyclopentyl, cyclohexyl, trifluoromethyl, phenyl, naphthyl, lower alkoxy, phenoxy, or benzyloxy. Most preferably the chelate portion of the molecule is derived from a beta-diketone and Y is lower alkyl.

The more readily available hydrocarbylimino derivatives of beta-diketones, beta-keto aldehydes, and betaketo esters, i.e., compounds of formula V in which one 2 is NR, are those in which R is phenyl, optionally substituted with up to two inert substituents which can be lower alkyl, lower alkoxy, or halo, particularly chloro. These values of R are therefore preferred in products of the invention of this type, and also in products in which both Zs are NR. Most preferably R when present is phenyl. In addition, of the three types of beta-dicarbonyl compounds, beta-diketones form hydrocarbylimino derivatives most readily, and therefore when one Z is NR in formula V, the Y groups are preferably other than hydrogen, alkoxy, aryloxy, and aralkoxy.

Tropolones are described, for example, by Nozoe in Chapter VII of Non-Benzenoid Aromatic Compounds," edited by Ginsburg (Academic Press, I959). Formation of metal ehelates by tropolones is discussed here and also by Bryant et al., .I. Am. Chem. Soc., 75, 3784 (1953). Tropolones that are operable to produce chelating ligands, Ch, in the products of the present invention by loss of a hydrogen include tropolone itself and tropolones containing up to two or thre inert three such as chloro, bromo. lower alkyl, and phenyl. In addi tion to tropolone, having the formula examples are 4 -isopropyltropolone, 3- bromotropolone, 3,5,7-tribromotropolone, 3-bromo7- methyltropolone, S-methyltropolone, 5- chlorotropolone and S-phenyltropolone. Preferably the number of substituents is to 1.

Th chelate ligand, Ch, formed by removal of the hydroxyl hydrogen from tropolone or a substituted tropolone will have the formula where Q" is chloro, bromo, lower alkyl, or phenyl, and n isO, l, 2,or 3.

Because of availabilty of intermediates, ease of prep aration, and stability of the palladium compounds, a preferred class of Ch ligands are those derived from beta-diketones, beta-keto esters, betahydrocarbylimino ketones, heta-bis( hydrocarbylimino)alkanes and tropolones. Most preferred are ligands, Ch, derived from beta-diketones, beta-keto csters, beta-hydrocarbylimino ketones, and tropolones.

The Ligand L Examples of L are pyridine, quinoline, isoquinoline, thiazole, benzothiazole, oxazole, benzoxazole. isothiazole, benzisothiazole, isoxazole, benzisoxazole, pyrazole, indazole, imidazole, benzimidazole, triazole, and benzotriazole, together with such compounds containing inert substituents such as lower alkyl, lower alkoxy, or halo. Preferably the molecule L will contain at most 2 such substituents. Examples of substituted ligands are 2-fluoropyridine, 3-bromopyridine, 4-chloropyridine, 3,5-dibromodipyridine, 3-chloro4-ethoxypyridine, 5-ethyl-2-methylpyridine, 2-pentylpyridine, 2,4- dimethoxypyridine, 6-methoxy-4-methylquinoline, 3- ethylquinoline, 4-methylthiazole, 5-ethoxy-2- methylthiazole, and 2-hexyl-5-methoxyoxazole. Preferably L contains at most 12 carbons. More preferably it is a monocyclic compound, and most preferably it is unsubstituted.

The Anion A The compounds of formula III are essentially salts, the palladium-containing portion of which constitutes the cation. A is simply the requisite and corresponding anion and can be any anion having an oxidation poten tial of at most about 0.5.

Oxidation potential is a well-known property. It is discussed, for example, in Moeller, Inorganic Chemistry" pages 284 ff. (Wiley, I952), and in Langes Handbook of Chemistry, 10th edition, pages 1212 ff. Oxidation potential measures the relative ease with which a reductant in an electrode reaction is oxidized, i.e., its reducing power. A large number of oxidation potentials are tabulated in Moeller and in Lange, and also in US. Department of Commerce Document AD 617400, Theory of Plating by Catalytic Chemical Reduction, by D. .I. Levy.

A can be a relatively large anion which, when added to a solution containing a cation of formula III, causes precipitation of a relatively insoluble salt. Examples of such anions are hexafluorophosphate (cf. examples 8 and I6), hexafluoroarsenate, tetrachloroaurate, tetrachlorobismuthate, tetrachloroferrate, tribromomercurate, hexachlorophosphate, hexachloroplatinate, hexabromoantimonate, tetraphenylborate, perchlorate, reineckate, and picrate.

Alternatively, A can be a common anion such as chloride, fluoride, bromide, iodide, nitrate, sulfate, or

acetate.

EMBODIMENTS OF THE INVENTION The following examples illustrate the products of the invention. Examples 1,9, l2 (first part] and I3 disclose compounds of formula I; 2-7, ll, 12 (second part), 14 and l5, formula II', and 8 and I6, formula III.

EXAMPLE 1 cs Pd c1 C1-Pd O I Et ll ca: CH [Ed-C1 2 mzc Eta C 85 3,6-Bis(diethylaminomcthyl)1,2- phenylenedipalladium(ll) Dichloride and 2,5-Bis(diethylaminomethyl)-1,4- phenylenedipalladium(ll) Dichloride To 400 ml of a 0.19M solution of Na PdCh in 95 percent aqueous methanol was added a mixture of 9.4 g (0.038 mole) of a,a'-bis(diethylamino) p-xylene and 12.8 g (0.076 mole) of N-cyclohexylpiperidine. The reaction mixture was stirred overnight and was then fil tered. The solid on the filter was purified by digestion with 400 ml of hot methanol, followed by filtration and drying, to give 2,5-bis(diethylaminomethyl)-l ,4- phenylenedipalladium(II) dichloride, Dilution of the filtrate with water gave no precipitate. On extraction of the aqueous methanol solution with methylene chloride, the yellow color went into the methylene chloride.

Addition of water to the original, yellow filtrate gave a solid, which was separated by filtration. The filtrate was extracted with methylene chloride, the extract was combined with the methylene chloride extract of the preceding paragraph, and the solid was digested with the combined methylene chloride extracts and separated by filtration and dried, to give 6.2 g of 3,6 bis(diethylaminomethyl )-l ,2- phenylenedipalladiumfll) dichloride.

Anal. Calcd for C, H Cl N Pd C, 36.3, H, 4.92; Cl, 13.4; N, 5.29; Pd, 40.1 Found: c, 36.5; H, 4.90; Cl, 13.5; N, 5.03; Pd, 40.3.

NMR (CD CN): s 3.87, O] s 6.38, a broad rn 1.2 ppm) centered around 7.51, t (J 7.0 cps) at 8.781- in 112:4:6 ratio, assigned to the equivalent aromatic Hs, benzyl CH 's, nonequivalent ethyl CH 3 s, and ethyl CH S.

Later experiments showed that the extraction with methylene chloride is not necessary The identity of the 2,5-, 1,4-isomer was confirmed by conversion of the compound to the products of Exmaples 2, 3, and 4.

If Na PdBn is substitued for Na PdC] in the foregoing example, the products are 3,6- bis(diethylaminomethyl)-1,2- phenylenedipalladiumfll) dibromide and 2 ,5-bis(diethylaminomethyl}l ,4- phenylenedipalladium(ll) dibromide.

EXAMPLE 2 1 NEt e Me CH d M CH1 Pd Pd cg 'l'o 'g Me Et N ca Mc Me CH 1 2 Pd -C1 2,5-Bis(diethylaminomethyl )-l ,4- phenylenedipalladium( ll) Bis( 2,4-pentanedionate) To a suspension of 10.6 g (0.02 mole) of crude 25- bis( diethylaminomethyl )-l ,4- phenylenedipalladium(ll) dichloride in 200 ml of dimethylformamide was added 9 g. (0.09 mole) of 2,4 pentanedione and 12 g (0.09 mole) of diisopropylethylamine. The reaction mixture was stirred at 50C for 1 hour. Attempted filtration proceeded very sluggishly, even after addition of activated charcoal and diatomaceous earth. The entire mixture was diluted with water and extracted with methylene chloride, and the extracts were chromatographed on alumina. The pale yellow band was collected (methylene chloride), the eluate was stripped to dryness, and the residue was stirred with methanol and filtered. There was obtained 7.6 g (58 percent) of creamy solid 2,5- bis(diethylaminomethyl )-l ,4- phenylenedipalladiumfll) bis(2,4pentanedionate) mp dec. 240-242C (after recrystallization from tolueneheptane).

Anal. Calcd for C ,,H N O,Pd C, 47.6; H, 6.10; N 4.27. Found C 47.5; H, 6.18; N, 4.35.

The NMR spectrum agreed with the above structure: 5 3.07, s 4.66, s 6.00, m (2 overlapping quadruplets) 7.03, s 7.96, s 8.05, and t (J 7.0) 8.471- in l:l:2:4:3:3:6 ratio. They were assigned to aromatic Hs, pentanedionate ring Hs, benzyl CH ethyl CH ptwo pentanedionate methyls and ethyl group methyls.

If 4-phenylimino-2-petanone is substituted for 2,4- pentanedione in essentially the procedure of the foregoing example, the product is 2,5-bis(diethylaminomethyl)- l ,4-phenylenedipalladium(Il) bis(4-phenylimino- 2pentanonate). With ethyl 3'oxobutanoate as the chelate ligand source, the product is 2,5-bis (diethylaminomethyl)-l,4-phenylenedipalladium(ll) bis(ethyl 3 oxobutanoate).

EXAMPLE 3 Me C CIH NEC CMe M830 EtgN CH2 Ci ie 2,5-Bis(diethylaminomcthyl)-1,4- phenylenedipalladium( ll) Bis( 2,2,6,6-tetramethylheptanc-3 ,S-dionate) A mixture of 10.6 g (0.002 mole) of 2,5- bis(diethylaminomcthyl)-1,4- phenylcnedipalladium(ll) dichloride, 0.06 mole of 2,2- ,6,6-tetramethyl-3,5heptancdione, and 0.06 mole of diisopropylethylamine was stirred in 200 ml of dimeth- EXAMPLE 4 CH -Elit O R O Et lI-Cll 2,5-Bis(diethylaminomethyl)-1,4- phenylenedipalladium(ll) Ditropolonate A mixture of 5.3 g (0.01 of 2,5- bis(diethylaminomethyl)-l,4- phenylenedipalladiumfll) dichloride, 80 ml of dimethylformamide, 3.6 g (0.03 mole) of tropolone, and 3.8 g (0.03 mole) of diisopropylethylamine was sitrred and heated up to 80C. The mixture was filtered without cooling, and the solid on the filter was washed with dimethylformamide and methanol and dried. Additional product was obtained by diluting the filtrate with water. The yield of combined and dried 2,5- bis( diethylaminomethyl l ,4- phenylenedipalladiumfll) ditropolonate was 4.2 (60 percent), mp l85-187C.

Anal. Calcd for C H N O Pd: C, 51.4; H, 5.14; N, 4.00. Found: C, 51.2; H, 5.28; N, 4.08;

mole) 3,6-bis(diethylaminomethyl) 1 ,2- phenylenedipalladium( II) Bis 2,4-pentanedion ate A mixture of 1.1 g of 3,6-bis (diethylaminemethyl)- l,2-phenylenedipalladium(II) dichloride, 2 ml of 2,4- pentanedione, and 3.6 ml of diisopropylethylamine was briefly refluxed in ml of dimethylformamide and poured into 100 ml of ice water. The mixture was extracted with methylenc chloride. The extracts were washed with water and evaporated and the residue was stirred with methanol and filtered, to give 1.2 g (88 percent) of 3,6-bis(diethylaminomethyl)1,2- phenylenedipalladium(ll) bis(2.4-pentanedionate). Another sample, prepared by essentially the same method, was purified for analysis by recrystallization from heptane; mp 195197C.

Anal. Calcd for C ,,H,,,N.,O,Pd C, 47.6; H, 6.10; N, 4.27; M01. Wt. 656. Found: C, 47.2; H, 6.36: N, 4.28; M01. Wt. 661 by VPO (vapor pressure osmometry) in chloroform at 37C.

EXAMPLE 6 3,6-Bis(diethylaminomethyl)-l ,2- phenylenedipalladium( II) Bis( 2 ,2,6,6-tetramethy|-3 ,S-heptanedionate To 20 ml of dimethylformamide was added 1.1 g (0.002 mole) of 3,6-bis(diethylaminomethyl)-1,2- phenylenedipalladium(lI) dichloride, 1.2 g (0.006 mole) of 2,2,6,6-tetramethyl-3,S-heptanedione, and 0.8 g (0.006 mole) of diisopropylethylamine. After being stirred overnight at room temperature. the yellow solution was poured into ml water and the mixture was extracted with methylene chloride. The extracts were washed three times with water and stripped, and the residual solid was washed with methanol and dried, to give 1.5 g (two crops; 94 percent) of yellow 3,6- bis(diethylaminomethyl l ,2- phenylenedipalladium(ll) bis(2,2,6,6-tetramethyl-3,5- heptanedionate), mp dec. 204205C with prior darkening from about C. The product was recrystallized from heptane.

Anal. Calcd for C;,,,H N O.,Pd C, 55.4; H, 7.79; N, 3.40; Pd, 25.7. Found: C, 55.4; H, 8.29; N, 3.46;

NMR (CDCl;,): s, 3.40, s, 4.53, d (J 13.5) 5.20; d (J 13) 6.60; m -6.7, m -7.4, t (J =7) 8.68; s 8.78, 5 8.961- in 1:l:l:1:2:2:6:9:9 ratio.

EXAMPLE 7 3,6-Bis(diethylaminomethyl)-l ,2- phenylenedipalladium (II) Ditropolonate A mixture of 2.65 g of 3,6-bis(diethylaminomethyl)' 1,2-phenylenedipalladium(ll) dichloride (0.005 mole), in 40 ml of dimethylformamide was sitrred with 1.8 g (0.015 mole) of tropolone and 1.9 g of diisopropylethylamine at 50C. for 30 min. A clear yellow solution resulted. Upon addition of water, a yellow solid precipitated. It was taken up in methylene chloride, and the extracts were dried, filtered, and stripped. 3,6- Bis(diethylaminomethyl)-1,2- phenylenedipalladium(ll) ditropolonate was obtained in 3.1 g (88 percent) yield. It was recrystallized by adding a concentrated methylene chloride solution to heptane and boiling off methylene chloride; mp 184l85C.

Anal. Calcd for C ,,H N O Pd C, 51.4; H, 5.14; N, 4.00. Found: C, 51.1; H, 5.23; N, 3.98.

NMR: s 2.98, d (J 1.4) 3.08, S 3.39, complex :1 3.5, s 5.92,q (J 7.0) 6.97, t (.l 7.0) 8.35 in 2:2:l:1:2:4:6 ratio.

EXAMPLE 8 NEt F 3.6-Bistdiethylaminomethyl l .2-phenylenebis( pyridinepalladiumfll]) p.-Chloride Hexat'luorophosphate A small sample of 3.6-bis(diethylaminomethyl-l.2- phenylenedipalladium(ll) dichloride was stirred with excess aqueous pyridine. To the resulting solution was added excess NH PF The precipitatc was extracted with methylene chloride and purified by chormatography on alumina. washing with mcthanoi and ether. and

drying. to give yellow crystals of 3.6- bis(dicthylaminomethyl l .2-phenylenebis(- pyridenepalladiunn ll L-chloride hexafluorophosphate.

Anal. Calcd for c H -ClF N PPdi C. 39.2; H 4.52; Cl. 4.45; F. 14.3; N. 7.03; Pd. 26.6. Found: C, 39.2; H, 4.64; Cl. 3.88; F. 14.9; N. 7.00; Pd. 26.7.

NMR (CD- CN]: rn 1.75.1n 2.6. m 3.0, s 3.80, s 6.31. m (2 overlapping quadruplets) 7.6 and t (J =70) 8.821 in 211:1:2z4z6 ratio. assigned to pyridine a-Hs, pyridine BHs. phenyl H's. benzyl CH ethyl CH and ethyl CH respectively.

If sodium tetrachloroaurate. NaAuCl; 2H O, is sub stituted for NHJF in the foregoing procedure. the product is 3.6 bis(diethylaminomethyl)- l .Lphenylenebis-(pyridine palladium(ll)) p-chloride tetrachloroaw rate. If a solution of either of these products is passed through the nitrate form of an anion-exchange resin. 3.6-bis(diethylaminomethylyl.2-phenylenebis(- pyridinepalladium(ll)) p-chloride nitrate is obtained.

EXAMPLE 9 3.6-Bis(dipropylaminomethyl)-1,2- phenylenedipalladium(ll) Dichloride and 2.5-Bis(dipropy1aminomethyl)-l,4- phenylenedipal1adium(ll) Dichloride To 500 ml of a O.l9M methanolic solution of Na PdCl was added 14.4 g .048 mole) of a,a'-bis(- dipropylaminotp-xylene and 12.3 g (0.095 mole) of diisopropylamine. After 5 hours the mixture was filtered and the solid was washed with water and methanol. It was then stirred with 400 ml of methylene chloride. filtered, washed with some more methylene chloride. and dried, to give 4.0 g (14 percent yield) of 2,5 bis(dipropylaminomethyl)1.4- phenylenedipalladiumfll) dichloride.

The filtrates were combined, stirred with more water, and extracted with methylene chloride. The extracts were stripped to dryness, and the residue was stirred with acetone. filtered. and dried. yielding 20.7 g (74 percent) of 3.6-bis(dipropylaminomethyl)-[,2- phenylenedipalladium( ll) dichloride.

The identities of the two products were confirmed by their conversion to the products of Examples and EXAMPLE 10 mole) of 2.5-

heptanedionate was stirred at 50-60C for 2 min in ml ol'dimethylformamide. The product was isolated by dilution of the reaction mixture with water. extracting with methylene chloride. chromatographing on alumina, and triturating with methanol. 2.5- Bis( dipropylaminoethyl )-l .4-phenylenedipalladium bis(2,2.6.6-tetramethyl-3,5,-pentanedionate) was ob tained in 68 percent yield and was recrystallized from tolueneethanol; mp 247248C dec.

Anal. Calcd for C H N O Pd C, 57.3; H. 8.18; N. 3.18. Found: C 57.6; H. 8.12; N. 3.16.

NMR: s 3.08, s 4.39, s 6.02, m -72. m -78, s 8.79. s 8.87 and t (J 7.0) 9.091 in l:l:2:4:4:9:9:6 ratio.

EXAMPLE ll 3 .6-Bis(dipropylaminomethyl l ,2 phenylenedipalladium( I1) Bis( 2.2.6.6-tetramethyl-3,S-heptanedionate The procedure of Example 10 was essentially repeated except that 3.6-bis(dipropylaminomethyl)-1,2- phenylenedipalladiumfll) dichloride was used instead of the 2.5-. 1,4- isomer. 3.6-Bis(dipropylaminomethyl)- l.2-phenlyenedipalladium(ll) bis(2.2,6.6-tetramethyl- 3.5-heptanedionate) was obtained in 65 percent yield (2.9 g; two crops) as yellow crystals, mp ll86C.

Anal. Calcd for C H N O Pd C, 57.3; 8.18; N, 3.18. Found: C 57.7; H, 8.07; N, 2.84.

NMR: 5 3.4l. s 4.52, d (J 13 5.18, d (J l3l3) 6.47. m 6.5-8.6, s 8.75 and s 8.92 and t (J 7.0) 9.071'in 1:]:1:l:8:9:9:6 ratio.

EXAM PLE l2 2,5-Bis(dimethylaminomethyl )-l ,4- phenylenedipalladium( ll) Bis( 2.4-pentanedionate) 2,5-Bis(dimethylaminomethyl)-l,4- phenylenedipalladiumfll) dichloride was prepared by stirring 400 ml of O.l9M Na PdCh with 7.3 g (0.038 mole) of a,a-bis(dimethylamino)-p-xylene and 9.8 g (0.076 mole) of diisopropylethylamine overnight, Separating the solid by filtration. washing, and drying. The solid was stirred overnight in dimethylformamide with 9 g of 2,4-pentanedione and 12 g of diisopropylethylamine. The mixture was diluted with water and the product was extracted with methylene chloride and purified by chromatography on alumina. Stripping of the fraction eluted with methylene chloride and acetone. followed by trituration with methanol filtration and drying gave 7.1 g (31 percent overall) of off-white 2,5- bis(dimethylaminomethyl )-l ,4- phenylenedipalladiumfll) bis( 2,4-pentanedionate which was recrystallized from xylene. lt darkened gradually above about 220C.

Anal. Calcd for C H N O Pd C. 44.0; H, 5.33; N. 4.67. Found: C, 43.2; H, 5.37; N. 4.63.

NMR (CDCl;.): singlets at 3.07, 4.65, 6.03, 7.13, 7.97. and 8.021 in 1:1:2:6:3:3 ratio assigned to aro matic H's, pentanedionate CH, benzylie CH MCI-1 and pcntanedionate CH EXAMPLE 13 CH 0H O NEt l Pd C1 c1 4,6-Bis(diethylaminomethyl)-1,3- phcnylenedipalladium(ll) Dichloride To 400 ml of 0.19M Na PdCh solution was added 9.45 g (0.038 mole) of a,0:'-bis(diethylamino)-mxylene and 9.82 g (0.076 mole) of diisopropylethylamine. The reaction mixture was stirred at room temper ature for 6 hours and was then filtered. The solid was washed with water and methanol and was air-dried overnight, to give 4,6-bis(diethylaminomethylJ-l,3- phenylenedipalladiumfll) dichloride. The structure of the product was confirmed by its conversion to the products of Examples l4, l5, and 16.

A small amount of the bis(diethylaminomethyl)-1,3- phenylenedipalladiumfll) dichloride is also formed in the foregoing procedure.

If a,a'-bis(diethylamino-o-xylene is substituted for the meta isomer in the foregoing example, the product is 5,6-bis(diethylaminomethyl)-l,4-dipalladium(|l) dichloride.

isomeric 2,6-

EXAMPLE l4 4,6-Bis(diethylaminomethyl) 1,3- phcnylenedipalladium(ll) Bis(2,4-pentanedionate) A mixture of 10.6 g (0.02 mole) of 4,6- bis(diethylaminomethyl )-l ,3- phenylenedipalladiumfll) dichloride, 6 g (0.06 mole) of 2,4-pentanedione, and 7.7 g (0.06 mole) of diisopropylethylamine was stirred at 50C for 1 hour. The mixture was diluted with 400 ml of water. The product was extracted with methylene chloride and purified by chromatography on alumina, eluting with methylene chloride and then with acetone. After evaporation of the solvents, the residual solid was taken up in l ml of methylene chloride, the mixture was treated with activated charcoal and filtered, and the filtrate was evaporated. The evaporation residue was stirred with methanol and filtered yielding 4.7 g (two crops; 37 percent) of pale creamy 4,6-bis(diethylaminomethyl)-1 ,3- phenylenedipalladiumfll) bis(2,4-pentanedionate), mp dec. about 230C with prior darkening at about 200C.

Anal. Calcd for C H N o Pdz C, 47.6; H, 6.10; N, 4.27; Pd, 32.3; Mol. Wt. 656. Found: C, 47.7; H, 6.07; N, 4.31; Pd, 31.3; M01. Wt. (by VPO in CHCl at 37C): 662.

The NMR spectrum was in excellent agreement with the stated structure, exhibiting singlets at 2.75, 3.43, 4.71, 6.12, m (2 overlapping quadruplets) 7.1, s 8.00, s 8.09, t (.1 7) 8.501 in the correct 1:l:2:4:8:6:6:l2 ratio. They were assigned to aromatic 2 H, aromatic H, acetylacetonate H's, benzyl CH ethyl CH two acetylacetonate acetyls and ethyl group methyls.

EXAMPLE l5 4,6-bis(diethylaminomethyl )-l ,3- phenylenedipalladiumfll) Ditropolonate The procedure of Example 4 was essentially repeated, except that 4,6-bis(diethylaminomethyl)-l,3- phenylenedipalladium(ll) dichloride was used in place of the 2,5-, 1,4- isomer. 4,6- Bis( diethylaminomethyl) l ,3-phenylenedipalladium( ll) ditropolonate was obtained in 66 percent yield as a yellow solid. A separate sample, prepared by essentially the same method, was recrystallized from toluene for analysis; fibrous needles, mp 236-238C.

Anal. Calcd for C ,,H N O,Pd,: C. 51.4; H, 5.14; N, 4.00. Found: C, 53.2; H, 5.44; N, 3.77.

The NMR spectrum had m 2.5-2.8, m 2.8-3.3, s 3.38. s 6.05, q 6.95, t (7.0) 8.421 in 5:1:lz214z6 ratio.

EXAMPLE 16 ca 11 Et N Q NEt 4,6-Bis( dimethylaminomethyl l ,3-phenylenebis( dipyridinepalladium(ll)) Bis(hexafluorophosphate) A solution of 400 ml of 0.19M Na PdCh was stirred with 18.9 g (0.036 mole) of a,a'-bis(diethy1aminomethyl)-m-xylene and 9.8 g (0.076 mole) of diisopropyle thylamine for 3 days at room temperature. To the dark suspension, which contained 4,6- bis(diethylaminomethyl l ,3- phenylenedipalladium(l1) dichloride, 20 ml of pyridine was added, along with two spoonfuls of activated charcoal. The mixture was filtered into 1200 ml water containing 0.15 mole NH PF The precipitated solid was dissolved in methylene chloride and chromatographed on alumina, eluting first with methylene chloride, then with acetone. The eluate was evaporated to dryness in vacuo. The residue was dissolved in about 40 ml of acetone and, while still hot, diluted to 500 ml with ethyl acetate. The precipitated crystalline solid was filtered and washed with ethyl acetate and ether. After air-drying there was obtained 28.2 (74 percent) of white crystalline 4,6-bis(diethylaminomethyl)-1.3-phenylenebis(- dipyridinepalladium( ll)) bis hexafluorophosphate), mp 205208C dec. Analysis was carried out on another sample prepared by essentially the foregoing method.

Anal. Calcd for C H F N P Pd C, 40.6; H, 4.33; F, 21.5; N, 7.91; Pd, 20.0. Found: C, 40.3; H, 4.37; F, 22.3; N, 7.71; Pd, 21.7.

The NMR spectrum was in accord with the above structure displaying the following peaks: m 1.8 (8 Hs, 2,6-py), t (J 8) 2.61 (4 Hs, 4-py); m 3.17 (8 Hs, 3,5- py); 5 3.681(1 H, 2-arom.); 5 5.807(1 H, 4-arom.); s 6.35 (4 Hs, benzyl CH m (2-overlapping quads) 7.61- (8 H's, ethyl CH t (.1 7) 8.901(12 Hs, ethyl CH If S-ethyl-Z-methylpyridine is substituted for pyridine in the foregoing procedure, the product is 4,6- bis(diethylaminomethyl)- l ,3-phenylenebis{bis(5- ethyl-2-methylpyridine)palladium(ll)] bishexafluorophosphate. With thiazole. 4,6- bis(diethylaminomethyl)-l ,3-phenylenebis(dithiazolepalladium(ll)) bishexafluorophosphate is ob tained. With isoxazole, the product will be 4,6- bis(diethylaminomethyl)-l,3-phenylenebis(diisoxazolepalladium(ll)) bishexafluorophosphate.

Other examples of products of the invention are:

2-butyl-4,6-bis(diethylaminomethyl )-l ,3-

phenylenedipalladium(ll) dibromide 3,6-bis(dioctylaminomethyl)-l ,2-

phenylenedipalladiumfll) dichloride 3,6-bis(dimethylaminomethyl)-2,5-diisopentyloxy- 1,4-pheny1enedipalladium(ll) dibromide 4,6-bis(dipropylaminomethyl)-2-ethoxycarbonyll,3-phenylenedipalladium(ll) dichloride 19 -chloro-4,6-bis(dibutylaminomethyl)-1,3- phenylenedipalladium(ll) ditropolonate 4,6-bis(diethylaminomethyl)-l,2-

phenylenedipalladium(ll) bis[(m-tolylamino)-4- (m-tolylimino)pentenate] 4,6-bis(dipropylaminomethyl)-2-nitro-[,3-

phenylenedipalladiumfll) bis(5-methyl-2,4- hexanedionate 4-chloro-3,6-bis(diethylaminomethyl)-1,2-

phenylenebis(pyridinepalladium([Up-bromide hexafluorophosphate 2,o-bis( dimethylaminomethyl )-l ,4-

phenylenebis[bis(3- methylpyridine )palladium( ll ]bis( hexafluoroarsenate.

UTILITY Products of formula I are useful as intermediates in the preparation of products of formulas II and [11. All the compounds are useful as components of preciousmetal decorating compositions. Although the compounds of Formula II are the best for this use because of their relatively good solubility in organic solvents, the relatively less soluble products of types I and Ill can be applied as dispersions in adhesive binders. All the compounds are also useful as catalysts for organic reactions, particularly the polymerization of acetylene. The latter two utilities are shown below,

As noted, products of formula ll are particularly useful as components of precious-metal decorating compositions because of their good solubility in organic solvents. For example, a decorating composition comprising a palladium compound of formula II, a gold compound, a flux, a solvent, at viscosifying agent, and a dye can be painted on the substrate to be decorated, and the substrate can then be fired at about 500800C to give an attractive metal coating. Such compositions and procedures are well known to those skilled in the art. They are described, for example, in US. Pat. No. 3,216,834, in which bis(dialkylsulfide)palladium(II) dichlorides are used as the palladium source. The palladium compounds of formula II of the present invention have higher palladium contents than their counterparts of my application Ser. No. 792,841 since they contain two palladium atoms bonded to each benzene ring rather than one per ring.

As shown by the following Examples, products of formulas II and III are also useful as catalysts, particularly for the polymerization of acetylene. Polyacetylenes, especially those of relatively low molecular weight illustrated in Example B, are useful as components of drying-oil systems and as absorbers of ultraviolet radiation, as stated in French Pat. No. l,283,869.

EXAMPLE A In an atmosphere of nitrogen, a glass ampoule was charged with 0.ll g of 3,6-bis(diethylaminomethyl)- l,2phenylene-dipalladium(ll) dichloride and ml of trdichlorobenzene and sealed The sealed ampoule was placed in a shaker tube, which was evacuated, flushed with nitrogen, evacuated again, closed, cooled, and coldpressured with 200 g of actylene. The shaker tube was heated at 200C for 8 hours with shaking. The ampoule broke, and its contents were released to the tube, at the start of the shaking period. During the 8 hours the pressure fell from 380 psi to 0 psi, corresponding to a complete reaction of the acetylene. After the tube was cooled, vented, and opened, it was found that all the acetylene had been converted to polyacetylene.

EXAMPLE B By essentially the procedure of Example A, 2.0 g. of acetylene, 0.1 l g of 3,6-bis(diethylaminomethyl)-1,2- phenylenebis(pyridinepalladium(ll))p.-chloride hexafluorophosphate (cf. Example 8), and [0 ml of odichlorobenzene were heated at 200C for 8 hours in a closed system under autogenous pressure. During this time, the acetylene was completely converted to a polyacetylene that was soluble in o-dichlorobenzenev Since obvious modifications and equivalents will be evident to those skilled in the chemical arts, I propose to be bound solely by the appended claims.

The embodiments of the invention in which an exclu sive property or privilege is claimed are defined as follows:

l. A compound of the formula the Rs, alike or different, are lower alkyl',

Q is primary or secondary lower alkyl, lower alkoxy,

halo, nitro, cyano or lower alkoxycarbonyl;

m is 0, l or 2; and

X is Cl or Br, with the proviso that each palladium atom is ortho to an R NCH group.

2. The compound of claim 1 bis(diethylaminomethyl )-l ,2- phenylenedipalladiumfll) dichloride.

3. The compound of claim 1 bis(diethylaminomethyl )-l ,4- phenylenedipalladiumfll) dichloride.

4. The compound of claim 1 bis(dipropylaminomethyl )-l ,2- phenylenedipalladiumfll) dichloride.

5. The compound of claim 1 bis( dipropylaminomethyl )-l ,4- phenylenedipalladium(ll) dichloride.

6 The compound of claim 1 bis(diethylaminomethyl) 1,3 phenylenedipalladiumfll) dichloride.

named 3,6-

named 2,5-

named 3,6-

named named 4,6 

1. A COMPOUND OF THE FORMULA
 2. The compound of claim 1 named 3,6-bis(diethylaminomethyl)-1,2-phenylenedipalladium(II) dichloride.
 3. The compound of claim 1 named 2,5-bis(diethylaminomethyl)-1,4-phenylenedipalladium(II) dichloride.
 4. The compound of claim 1 named 3,6-bis(dipropylaminomethyl)-1, 2-phenylenedipalladium(II) dichloride.
 5. The compound of claim 1 named 2,5-bis(dipropylaminomethyl)-1, 4-phenylenedipalladium(II) dichloride.
 6. The compound of claim 1 named 4,6-bis(diethylaminomethyl)-1, 3-phenylenedipalladium(II) dichloride. 